javax.servlet.ServletException: Error creating bean with name 'userService' defined in class path resource [applicationContext.xml]:
Cannot resolve reference to bean 'helloDao' while setting bean property 'helloDao';
nested exception is
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'helloDao' defined in class path resource [applicationContext.xml]: Initialization of bean failed;
nested exception is
org.springframework.beans.InvalidPropertyException: Invalid property 'jdbcTemplate' of bean class [dao.HelloDaoImpl]: No property 'jdbcTemplate' found
我一次又一次地得到这个例外但是找不到原因.. 我正在附上我必要的文件，以使其更容易理解..
[web.xml中]
<web-app>
<display-name>helloWorld</display-name>
<listener>
<listener-class>
utils.listener.HelloContextListener
</listener-class>
</listener>
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>
org.apache.struts.action.ActionServlet
</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- Struts Action Servlet Mapping -->
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.me</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>/jsps/homepage.jsp</welcome-file>
</welcome-file-list>
</web-app>
[struts-config.xml中]
<struts-config>
<form-beans>
<form-bean name="formBean" type="ui.forms.UserRegisterForm"></form-bean>
</form-beans>
<global-forwards>
<forward name="home" path="/jsps/homepage.jsp"></forward>
</global-forwards>
<action-mappings>
<action path="/register" type="ui.actions.UserRegisterAction" name="formBean" validate="true" input="/jsps/homepage.jsp">
<forward name="success" path="/jsps/infoadded.jsp"></forward>
<forward name="error" path="/jsps/underConstruction.jsp"></forward>
<forward name="error2" path="/jsps/userinfo.jsp"></forward>
</action>
<action path="/home" forward="/jsps/homepage.jsp"></action>
</action-mappings>
</struts-config>
[applicationContext.xml中]
<beans>
<bean id="userService" class="service.UserServiceImpl" init-method="initialize">
<property name="helloDao">
<ref bean="helloDao"/>
</property>
</bean>
<bean id="helloDao" class="dao.HelloDaoImpl">
<property name="jdbcTemplate">
<ref bean="jdbcTemplate"/>
</property>
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<constructor-arg>
<ref bean="dataSource"/>
</constructor-arg>
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/helloworld" />
<property name="username" value="root" />
<property name="password" value="" />
</bean>
</beans>
[homepage.jsp]
<body>
<form action="register.me" method="post">
<pre>
Name : <input type="text" name="userName" >
Password : <input type="text" name="userPassword" >
<input type="submit" value="Click to Register">
</pre>
</form>
</body>
[所有java类]
public class UserRegisterAction extends Action {
@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
RegisterUser user=new RegisterUser();
UserRegisterForm form2=(UserRegisterForm)form;
user.setM_userName(form2.getM_userName());
user.setM_userPassword(form2.getM_userPassword());
int i= ((IUserService)HelloServiceFactory.getUserServices()).addNewUser(user);
if(i==1){
return mapping.findForward("success");
}
else {
request.setAttribute("Output", "Wrong Credentials");
return mapping.findForward("error");
}
}
}
public class HelloContextListener implements ServletContextListener {
@Override
public void contextDestroyed(ServletContextEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void contextInitialized(ServletContextEvent arg0) {
ClassPathResource classPathResource=new ClassPathResource("applicationContext.xml");
XmlBeanFactory beanFactory=new XmlBeanFactory(classPathResource);
HelloServiceFactory.setBeanFactory(beanFactory);
}
}
public class HelloServiceFactory {
private static XmlBeanFactory beanFactory;
public static XmlBeanFactory getBeanFactory() {
return beanFactory;
}
public static void setBeanFactory(XmlBeanFactory beanFactory) {
HelloServiceFactory.beanFactory = beanFactory;
}
public static IUserService getUserServices(){
return (IUserService)getBeanFactory().getBean("userService");
}
}
public class UserRegisterForm extends ActionForm {
/**
*
*/
private static final long serialVersionUID = 1L;
private String m_userName;
private String m_userPassword;
public String getM_userName() {
return m_userName;
}
public void setM_userName(String m_userName) {
this.m_userName = m_userName;
}
public String getM_userPassword() {
return m_userPassword;
}
public void setM_userPassword(String m_userPassword) {
this.m_userPassword = m_userPassword;
}
}
public class UserServiceImpl implements IUserService {
private IHelloDao m_dao;
public IHelloDao getM_dao() {
return m_dao;
}
public void setM_dao(IHelloDao m_dao) {
this.m_dao = m_dao;
}
public void initialize() {
}
public int addNewUser(RegisterUser user) throws Exception {
int stat=0;
try {
stat=m_dao.addNewUser(user);
} catch (Exception e) {
System.out.println(e.getMessage());
}
return stat;
}
}
public interface IUserService {
public int addNewUser(RegisterUser user)throws Exception;
}
public class RegisterUser {
private static String m_userName;
private static String m_userPassword;
public String getM_userName() {
return m_userName;
}
public void setM_userName(String m_userName) {
RegisterUser.m_userName = m_userName;
}
public String getM_userPassword() {
return m_userPassword;
}
public void setM_userPassword(String m_userPassword) {
RegisterUser.m_userPassword = m_userPassword;
}
}
public class HelloDaoImpl implements IHelloDao{
private JdbcTemplate template;
public JdbcTemplate getTemplate() {
return template;
}
public void setTemplate(JdbcTemplate template) {
this.template = template;
}
public int addNewUser(RegisterUser user) throws Exception {
Object []a={user.getM_userName(),user.getM_userPassword()};
return template.update("insert into user(uName, uPasswordv) values (?,?)", a);
}
}
public interface IHelloDao {
public int addNewUser(RegisterUser user)throws Exception;
}
我在错误页面底部得到的是
org.springframework.beans.InvalidPropertyException: Invalid property 'jdbcTemplate' of bean class [dao.HelloDaoImpl]: No property 'jdbcTemplate' found
答案 0 :(得分：0)
在您的应用程序上下文中，您已定义了以下依赖项。
<bean id="helloDao" class="dao.HelloDaoImpl">
<property name="jdbcTemplate">
<ref bean="jdbcTemplate"/>
</property>
</bean>
您可能缺少jdbcTemplate中字段HelloDaoImpl的设置者。请检查。
答案 1 :(得分：0)
<bean id="helloDao" class="dao.HelloDaoImpl">
<property name="jdbcTemplate">
<ref bean="jdbcTemplate"/>
</property>
</bean>
您应该在HelloDaoImpl类中设置相同的属性 <而不是
private JdbcTemplate template;
并为其重制你的getter / setter。